Frigidaire Dryer Error Code E66 — Thermal Fuse Tripped
What this means
Error code E66 indicates the thermal fuse (thermal limiter) has tripped open. This safety device blows when the dryer exceeds safe temperatures, usually due to restricted airflow from a clogged lint screen or blocked vent duct. The fuse must be replaced, and the root cause addressed.
Step-by-step fix
4 stepsClean the lint system thoroughly
Remove and clean the lint screen. Use a long brush to clean the lint trap housing. Disconnect and clean the entire vent duct from dryer to outside wall.
A clogged vent is the #1 cause of blown thermal fuses — always fix the vent before replacing the fuse.
Access the thermal fuse
Unplug the dryer and remove the back panel. Locate the thermal fuse on the blower housing or heating element enclosure.
The thermal fuse is a small rectangular or oval component with two wire terminals.
Test the thermal fuse
Disconnect one wire and test for continuity with a multimeter. A blown fuse will read open (OL).
A thermal fuse is a one-time-use device — once blown, it must be replaced. It cannot be reset.
Replace the thermal fuse
Remove the old fuse and install the new one in the same position. Reconnect wires and reassemble.
If you don't fix the airflow restriction that caused the fuse to blow, the new one will blow too.
When to call a professional
If the vent is clear and the fuse keeps blowing, the cycling thermostat or heating element may be malfunctioning.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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